Re: Dealer Says Not to Use Synthetic
My Honda Dealer has no problem putting in Mobil 0w-20 synthetic when I bring it in with a filter. Frankly, I don't trust them to put the right grade of their own oil anyway. I can get Mobil 0w-20 for $5.92/qt. which sounds much better than the $6.00 they would charge for conventional oil that may or may not be the right grade.
You should be fine mixing conventional oil with synthetic even if there is little added benefit, but I have heard never to mix different viscosities of oil together on the same fill. A Civic Hybrid should be fine on either straight 0w-20 or 5w-20, synthetic or not, but I would not use both.
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